| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
(Al,Zn)3Zr Dispersoid-assisted η′ Precipitation in a Model Al-Zn-Mg-Cu-Zr Alloy |
| Author(s) |
Huan Zhao, Yiqiang Chen, Surendra K. Makineni, Baptiste Gault, Dirk Ponge, Dierk Raabe |
| On-Site Speaker (Planned) |
Huan Zhao |
| Abstract Scope |
A small amount (0.05-0.16 wt.%) of zirconium is commonly added to Al-Zn-Mg-Cu alloys with the aim to reduce the grain size. Zr acts on grain refinement by forming nano-sized Al3Zr dispersoids during homogenization, hampering grain boundary motion through Zener pinning during downstream processing. In this talk, I will show microstructural evidence on the evolution of strengthening ηʹ precipitates during aging on prior presentL12-(Al,Zn)3Zr dispersoids in an Al-Zn-Mg-Cu-Zr alloy. A combination of atom probe tomography and aberration-corrected scanning transmission electron microscopy techniques were utilized for atomic scale compositional and structural characterization. Our findings explicitly provide a fundamental understanding on the formation mechanism of L12 structured composite dispersoids that coexist with η' precipitates. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |